The UK saw only a handful of examples of [AI fakes] going viral during the campaign period. While there's no evidence these examples swayed any large number of votes [there were] spikes in online harassment against the people targeted by the fakes [and] confusion among audiences over whether the content was authentic.
Sam Stockwell, Megan Hughes, Phil Swatton and Katie Bishop, "AI-Enabled Influence Operations: The Threat to the UK General Election," CETaS Briefing Papers (May 2024).